I have silly shirts, too. I have a ratty, brown, polyester, plaid thing that somehow worked its way from the thrift shop into heavy rotation. And if I were on national TV, I'd be kind of hurt if no one pointed it out.
So with that, here is Tom Seaver's shirt. It's full of butterflies.
Though you can't really tell much about it from a screenshot. You kind of need a GIF.